more than 90 world leaders are expected to attend. leaders of six nations will be speaking, including president obama, who was active in the anti-apartheid movement as a college student attending and speaking at a rally. >> i am one of the countless millions that drew inspiration from nelson mandela's life. my very first political action, the first thing i ever did that involved an slough or a policy or politics, was a protest against apartheid. >> reporter: >> reporter: president obama is as we speak, woufl, enrule to south africa still, and we've learned some about the seating arrangements. he and mrs. obama are in their normal cabin. in the medical office behind their cabin, that is where the bushes are. behind that, the senior staff cabin, that's where hillary clinton is. of course, when they were all not gabbing in the conference room, as we always learned that they did. >> i'm sure they did. >> potential an awkward moment, as you know, cuba's president will be sharing the same stage with president obama, both speaking at the mem